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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '235449ad1bc9d3fba547383c06a2c4f82b7e4a639c343ea6828fc53b59cc58e4' 
  AND token = '161c8/tcCGBjkU+mubgG3vxsdLTBSty2E8uVEKvQ4yQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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