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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ee7ffc0b2e25263c2c7a51676bab1361757f9f5fd550d42bee482755af8a1c7' 
  AND token = '68navSr5/nSR4gJ8w0ibBj+N5GRpcIMd1xS6QCwlzmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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