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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d3ccace1ecc3612ed2efb8e7062d110f00b11c695aca86b83cc1452f58f213c' 
  AND token = 'OzGxiNNPR6XBt4kxOOeguPAuy+7AA7kSYpOf3ufE8mo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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