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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3c188e89d022d7d5ac3e49e0a3a784db273bd909cda2d5ec5b6cea7f12e36c0' 
  AND token = 'cVOrRdGbVXHwlvI7d0RpcVJXF2MZodR64D7K57HNCtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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