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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fff2a76441812977d2ff7cf40eb1b8e483772e1953fa86b01e8b1f89ab57436a' 
  AND token = '4Xd5FZTo8JmZzb+baeTBcWOTwiVKPrZwcFZ0VDT5KhQ=' 
  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"
    }
  }
}