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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '534f1fe7e544507db79edad919ac500666f00e56585f08400ee5dfdd5306ba96' 
  AND token = '4CP5KQEMm9K5mBLKOOMCATDCteh3QJeGGvPl8O3hMoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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