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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bf145a80de505cd4398eb2a86f10f0672e7dc8031c9882f65909b2af57fd735' 
  AND token = 'c5NCAd/8zNRn/sV3XLjyjp7iHVZDicl3pVXN7y0I38M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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