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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da21c6e45b72625ac747103e491cc7918d86e6c1d9509fc455786387990651fa' 
  AND token = 'EWehdDPHH/3QXy7sjRuRZZ1tLHtUaZ8UT4KAsIjd96g=' 
  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"
    }
  }
}