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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0e346cba4efc99cb3e8764233561fd41f71abd26e194084a13c7eeb78ea4eee' 
  AND token = '/N5HXiCQjNDndOaslluJ6tf4arlBhZ+Irwga/Th8FBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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