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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ee53d9ca6ccf0bdcb7bfa841369757cb4c999e53d67faadd8545a1fcc03c85f' 
  AND token = '4MEfUdrGIEBeeBnOVCAphsF4SsPQov24MU6UD5rCA3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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