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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2daca2a3be2db76e2cbe8d232f2e67087585b2ddc80e09794bc02672107ddc3' 
  AND token = 'zHDks3/Yy7xSeiIZccesOq8ng1v5wBOXN/b/fIED2Ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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