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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cba3d9246e6a42e6ed434308c5f14f339d5909ee09ee3f615a51c036fb070e32' 
  AND token = '1s+/pVwkDnf5oDG0EjWabAbiQP7VfezHUFa6XgzzqgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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