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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b06a74fe6e423ac988db1c7774a01ffe827164bb8b94f85d4f3c764ff33b491' 
  AND token = 'fwCKY16a/4QIo/BXvwOtvFEJ9Sh32/U1Ytm4u5pPahk=' 
  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"
    }
  }
}