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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd7528af552cd43141c63bdd463b903d7daf038bd3b4aaeb8d55f21d7a267964' 
  AND token = '2Kdni6ezuxcxhuuB65C8J0O4Qf9H+m8LoQBdLo9fozg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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