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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce955464ed7e3a92d6d840cbc4dc7aa5e33db8c856c5376083eebbb743e29def' 
  AND token = 'QMu1VxK6uJsEg7A8cX2m57ywPDV6WD4Rt5uCy6D+HkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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