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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dc3613ddb2e48706059aac468bb84facf6d2a0547b63074bebc67f1813ea65e' 
  AND token = 'DbLgaLQsOk77PyrSzFVv6jWHrVHq6lM5dIDSyc9nBF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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