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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7f04c776db2c176d9e9cc1b2a9f7263e6716abcccb624cfd86bb7562d5facc2' 
  AND token = 'MCprfPmWfyN2BdvA/OqpW+v4Ha9SAv1OzQseqOVgpR4=' 
  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"
    }
  }
}