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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '123bd851ebfd3ea3eab9cf4fa84a5de90c06553062f7c74b3152e92c03c8301b' 
  AND token = '678PLMUfQXe6O2EhPF1rjeyWgV/N7EE6Cu1snHbeUyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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