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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55b34fbe2751154a009ae321fad0b9c6813a7b529b64cbee7286ba2e138a90d3' 
  AND token = 'J9CWENX0lmANVYf3DVbw+1pir4oQswFE7CceKGFhfS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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