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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a897d6b8384c41e830efd6da798e0d82431c525ac39215387f6582eccd10745f' 
  AND token = 's6f0h4gdoqaXumWdjv6DnvsE0mVw9Kb3+gOAXSFRR5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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