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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76fb0e8466366757443d46cebca7c2a301060bf6d7ce71b1adf11a87f7fd9763' 
  AND token = 'lzG/pQGZbND941d6ElwS5Fo75lQUffo42psW6+cYeys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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