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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1fb1c7b1634bccc57cb746a91a6845c730245dd47e14cc33a706412e18ac81f' 
  AND token = 'SRO7vxWtJbwwoLu7Or6KcEBzzd6j4A/Cd1ee/uJboPg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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