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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e5df46fe5b240081e882ed004a2863ac900ee3050dce19e6dd8ffe8273c9723' 
  AND token = 'mt2AgV3I+/IRL3dddAUl0x3mhOKveLv21wfGRPp1K8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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