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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f25b32d6a75de65a8c601ca9c660a0c9fe260df7f8303e90c35232c210cbae9' 
  AND token = '2xTycNWZFqit4SGcFK2ipWDIRQgrf0GBbS7uBwPyA0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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