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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbc12e55c1654884d056d1945f8fab5f6655582ec3fbbe8a6b34530913920b3f' 
  AND token = 'U4DJ0N3YtT6kWvkty7SdHGutKWolf+6tgKU5lCh1tmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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