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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '347e51d0198102968a03884151ccb1c680ab33448ec9139f1aaffbb49fc9a8b8' 
  AND token = 'qYWfY7iuzTZR1jh2kF4BmOk4iN6Q23sISh6m5cYwhgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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