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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37c0539fa316ebf73b41d44bbdbd1d5915bee57d57e58a85946a40b4eaae18e6' 
  AND token = 'eoGWseo0ks3TK8qa7GRJE2ukICTIC1mq8wtJJuCC5SY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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