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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46ccda3f1867af494acd81d9e3d9cbde0646d9eb17a668d016dce4b63077295e' 
  AND token = 'aDeLfjVUeHSdmBDUhN3t5a7ohw7hnDomH+UOcBXMXGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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