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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4adad7f4da323d7164a949843b33fc486aeb5d88ed41b57fa0b41eaa72a4a80' 
  AND token = 'F6zA3GgFgz/us9ODSViSWcbv9HAdIbUJRU4oe9dRbow=' 
  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"
    }
  }
}