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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fd8a6eac7659239c59ee1edb2def64fa035adf12285ba3b6a92712628f283fb' 
  AND token = 'PkbrX3rFguKxaIPJ1qMRwsm2W0Q7IeGalibU/bbkQQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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