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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb2519129c22bd6f72ba9744f9bb6c020daccfb6f8379e6087329aed7454e438' 
  AND token = 'evU+mdX4ynrGVn0BB19vdVGgTm3bGBIDOhbAd1d7wQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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