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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1461a4dc264f3213815f9c5e836f7edf4c6516675ba17dfb7581ce8665c45701' 
  AND token = 'KTqlr6ja5/DusRksTK2fL/7XC7TxPH9QyBxyS/9BPE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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