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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff4633580605546e3eac9a500b6e143233607536f2ce65708c4d565d02a0d5f0' 
  AND token = '8EHA9TvG0XmHAv8EBRjk1F/pWAGgWtGXfSj1GjZXkYc=' 
  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"
    }
  }
}