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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f86d8a9f230b95397075d47c5904cd1aef4cd5159324f58d9b59f1fd0489e811' 
  AND token = 'b6z20/46vt9KGeklQD1vaC7iv09NExNEnCZHG+hew78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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