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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69ee14b8f1de8e764d9be9dbac23cf4330854e4e4fed100f44e902b59ded46df' 
  AND token = 'MMhHMtHjRrSvgsAOEIKrm/A8kZ1899EWqAcglIhCm/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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