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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9f8facccf769dd57200c4179ee90b65428708340fb7a4f00c776be0e2a72e61' 
  AND token = 'NaCcyQ0vRWN/DA2HuB5c/SPB0IdoCMbFRy2IoBhvL/4=' 
  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"
    }
  }
}