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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37b4b05ec9ae410b8b204000ea4032aefa2b78de47f608a3d5bd475d73cc3bf0' 
  AND token = 'FcqKCYV3v37gDmX2y9PjhJxUiK9hrApls8369bx6he0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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