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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8274b129eee4b0345c0230246a2ee813dc5b232af606f60685b19d4bcc356247' 
  AND token = '9HHku9x7CjRHnUSYHKzYuUuV42wk3hmiY4r7nNc3A1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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