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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18b17d9d560e44918ef90a988e3b14cb5d9adf1b15d79bc9028989ab310cf56b' 
  AND token = '0H7qIX/GZkGgpT8b0uq9V0j5qLJxwPOzwYmkEXoqi74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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