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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0e20e62359bf1d7a594b510f9cab38cb4caaa0c5d60e9f3e07f7106b7d31ca0' 
  AND token = 'ErA84yP8lmcPuCCcef9hXYioBr7aVNUpAjUu5Dos4yA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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