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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb290d46869920ce8850457e87b8e4e66c9975eff1df34c7633b96a7fa1065dd' 
  AND token = '2qnOA2gYAjj0trSU47hO6Q14QopiACTrYv4fEeHekJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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