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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '903f4b56f5ed6e1dd950e389738ade20fa2f959c79e86bf324ad71139b8ee0fe' 
  AND token = '2XuAb/1/vlifD67hyIqJzhowx6fG9LEq1HtJ4E3DTqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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