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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77cfeca19037557bf646d45ed5a408d71b81a70effc6cfe7d7eed99c5eba93d8' 
  AND token = '2iE9VFbKLOAylzzUSgl6t1inTduUUQO5AMhX38R/ph8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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