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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0787568405101653badadf39d6a30d0a5fd0d9519289078ee3a77cae63328f5f' 
  AND token = 'q0yOElJFeiwGjU785nit2eZI10viJKYm3/0262fiJvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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