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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0c73d8c1c48cc74375adb323c601bf89d175c09c30ecf38e0c4c3302d24a514' 
  AND token = 'sqFs77hp6MYa6JitZxZZf75vjQ46rLzLL8P0TDV0ad8=' 
  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"
    }
  }
}