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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bd97303f6f5c9eab0bdb7f07af82fe9f082fc9e6ea32bcc16def32c8f92077f' 
  AND token = 'mqvFRn2mDrTqWwvBhzbj37SsxTHL55aZEoYYmggN1y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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