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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48d1724cd56ce6ee996742ecfb0ac8069934bea5f7c623e2ad7fa3a7a43c49a4' 
  AND token = 'xbAvH3Vh3QmSA8rdGBZDJuF1o8tWiLFSLhMN4r0K5qs=' 
  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"
    }
  }
}