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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61d3b5edb1556921d0f4318c9b8e0536b49d828c73730437004312d026eee1f3' 
  AND token = 'aLYZpjiiZPCuK/KeVX4k151b2Bin/CNts8Ous5f7HBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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