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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27c489c9c9b1196ef0993eaa247c5e3cdc041e4ab488fdbaf617d748bdd5a6f7' 
  AND token = 'RHG/i3aaHhyrMuWM3V0fJybavkkpKZOS6SVeor+z5yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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