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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24c832a40c31812df72831a7f76edf50b2e585075ec013940d6ca387802ad40f' 
  AND token = 'n5m5s3LXna9rZ8nM7hDnuDx1ygFb7aj4akaPLnwICGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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