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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad8420ca5782f5b3678e12d4da76811031c202e4577f4d43abb3c696cd98eb36' 
  AND token = 'KB1OrVK07PbSfJ7UfxJCn7/pgAG9e7iTO38KylTpKEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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