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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '977f9de7913325206a208e2890b6a2272d4b37554d5c977e4213243b45e2eb9f' 
  AND token = '4T2YOgJ+J8GKpt7uqpF76j0NchPgLf78q9/Xy3yMUDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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