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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba33676f0cb084847f4e0bc92e8400b75cffeb85bc6e3af1e18feecd5b0cf315' 
  AND token = '7hHSzzzS13mVrSRlNJd5x0zaN+CkpKR37B0Z6kGIKa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}