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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f32be70aec6d87aafa19cfaeb17b8a376e925248a1b62d5ea40dd5c80bb48d4' 
  AND token = '9AiKvgGfdIE/TA6bkRnpzNQzvPbKegW9EA5t/B+GPz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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