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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7795cea874bcde5003c5c1c7b47825bfca17b1621565bd681e2678cfa316b954' 
  AND token = '6a0OZk3DNVm27QgISe0JXGhyQKrq2HWnF5RhbKBUH0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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