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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c120e1608c4f3f606dbb7c0ce573c21de94e9d948340a4ee0df17727e9e96311' 
  AND token = 'l3YhREhkD64wnvgITYwtuPpmnOJFyoQ49kAF0U3Osqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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