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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea5d7f9cfb75a0e31d2abe534d991d2f1802e01b746040e4c16ca8dd4074923e' 
  AND token = 'i4Zt54InKD/sBr7akMYo+fh7jtvcEKgf8LAtydyIE4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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