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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c033438537829aee0f5687fbdd2d3442e4a588178d42a7b14b25e780d73a5fc' 
  AND token = '21SHaw4SqzdeBw4V/urhJTWfjMTrx59HvBHyP0xiYEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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